Traditional plastic mailing bags fail when exposed to rain, humidity, or rough handling. Our LDPE courier bags solve this through triple-layered extrusion technology, creating a moisture barrier that surpasses HDPE alternatives. The puncture-resistant material (3-8 mil optional) protects sharp-edged items, while the FDA-compliant food-grade variant works for gourmet deliveries. Integrate security features like void-tape seals or unique QR code windows for enhanced traceability. Compared to standard poly mailers, our LDPE shipping bags reduce damaged returns by 63% according to 2023 client surveys – a critical advantage for medical suppliers and certified mail services.